SQL Create Table

As we all know, SQL Server uses Tables to store and Manage Data and it is a combination of Rows and Columns. In order to create table, we have to use SQL Create Table Statement. The basic syntax for SQL Server create table is

CREATE TABLE [TableName]
(
    Column_Name1 Data_Type(Size) [NULL | NOT NULL],
    Column_Name2 Data_Type(Size) [NULL | NOT NULL],
     …
    Column_NameN Data_Type(Size) [NULL | NOT NULL]
);

Sql Server create table syntax items

• TableName: If you write the already existing name, it will throw an error
• Column_Name: Unique Column in the table of null or not nulls.
• Data Type: A valid Data type that the column will hold. For example, Int, Money, Varchar, Nvarchar and Date
• Size: Data types like Varchar, nvarchar, Char expects the size So, Please provide valid number here
• NULL or NOT NULL: If you select the NULL option then column will accept both normal values and NULL values. Otherwise, it will throw an error saying Column should not be empty

SQL Create Table Example

In this SQL create table statement example, we create a new one called Customer inside the Database

CREATE TABLE [Customer]
(
  [CustomerKey] [int] NOT NULL,
  [Name] [varchar](150) NULL,
  [DateOfBirth] [date] NULL,
  [EmailAddress] [nvarchar](50) NULL,
  [Profession] [nvarchar](100) NULL
)
GO

The command is executed successfully and you can see the Newly created table in the object explorer.

Messages
-------
Command(s) completed successfully.

From the above Sql Server Create Table code you can observe that We declared 5 Columns:

• Our first column is CustomerKey of Integer data type and it will not allow NULL values.
• Name column belongs to Varchar data type and it allows NULL values. We also assigned the size to 150, it means both the columns will accept up to 150 characters
• The third column is DateOfBirth of Date data type and allows NULLs. This will allow us to enter Date values only
• EmailAddress and Profession columns belong to NVarchar data type and it will allow NULL values.

NOTE: Before you start creating a table in SQL Server, It is always advisable to check if it exists or not.

Let me show you the newly created table in Object Explorer. Please expand the Columns folder to see the available columns. If you didn’t find it, Please click on the refresh button in object explorer.

SQL Create Table with Identity Column

In this SQL create table example, we create with identity column. For this, we defined the Customer Key column as an Identity column. This will auto-generate numbers starting with 1 and incremented by 1. (This is optional If you want You can remove IDENTITY (1, 1) portion completely)

CREATE TABLE [Customer11]
(
  [CustomerKey] [int] IDENTITY(1,1) NOT NULL,
  [FirstName] [varchar](50) NULL,
  [LastName] [varchar](50) NULL,
  [BirthDate] [date] NULL,
  [EmailAddress] [nvarchar](50) NULL,
  [Yearly Income] [money] NULL,
  [Profession] [nvarchar](100) NULL
)
GO

Messages
-------
Command(s) completed successfully.

See the newly created one

SQL Create Table with Primary Key

How to create Table in Sql Server with Primary Key column. We just added the PRIMARY KEY word to the Customer key. This will create a primary key on Customer key column.

CREATE TABLE [Customer111]
(
  [ID] [int] IDENTITY(1,1) NOT NULL,
  [CustomerKey] [int] NOT NULL PRIMARY KEY,
  [FirstName] [varchar](50) NOT NULL ,
  [LastName] [varchar](50) NULL,
  [BirthDate] [date] NULL,
  [EmailAddress] [nvarchar](50) NULL,
  [Yearly Income] [money] NULL,
  [Profession] [nvarchar](100) NULL
)
GO

SQL Create Table with All Constraints

SQL create Table statement to create with Identity Column, Primary Key constraint, Unique Key, and Check Constraint?. I suggest you refer to Primary Key, Unique Key, Default Constraint, and Check Constraint articles. As you can see,

• The last Name will accept Unique values.
• If the user doesn’t provide a value to the Profession column then it writes Software Developer as the default value
• Check constraint check whether the Age value is between 0 and 100

CREATE TABLE [Customer11111]
(
  [ID] [int] IDENTITY(1,1) NOT NULL,
  [CustomerKey] [int] NOT NULL PRIMARY KEY,
  [FirstName] [varchar](50) NOT NULL ,
  [LastName] [varchar](50) NOT NULL UNIQUE,
  [Age] [int] NULL,
  [EmailAddress] [nvarchar](50) NULL,
  [Yearly Income] [money] NULL,
  [Profession] [nvarchar](100) NOT NULL DEFAULT ('Software Developer'),
  CONSTRAINT CK_Customer11111_Age CHECK([Age] > 0 AND [Age] <= 100)
)
GO

Messages
-------
Command(s) completed successfully.

If you expand the definition in the Object Explorer, you can see all these constraints

Sql Create Table from Another

It provides Select into Statement to create a table using an existing one along with data (if any).. Data that we are going to use

Below query creates new one Customer1111111 using Employee definition, and insert all the records present in the Employee

SELECT  [EmpID], [FirstName], [LastName], [Education]
 ,[Occupation], [YearlyIncome], [Sales], [HireDate]
 INTO [dbo].[Customer1111111]
  FROM [dbo].[Employee]

Messages
-------
(14 row(s) affected)

Data inside this

SELECT  [EmpID], [FirstName], [LastName], [Education]
 ,[Occupation], [YearlyIncome], [Sales], [HireDate]
  FROM [dbo].[Customer1111111]

SQL Create Table in Management Studio

Within the Management Studio object explorer, Expand the Database folder in which you want to create table in Sql Server. Please select the folder and Right click on it will open the context menu. Select the New option and then select the below shown option.

It will open the following window to type the Column Name, Data Type and Checkbox to decide whether it allows any NULL values or Not. As you see, we added 7 columns of different data types.

Add Identity Column using Management Studio

Let me show you, how to add an identity column to already created table using Management Studio. First, select the column and Go to the Column Properties tab. Please change the IsIdentity option from default No to Yes in Identity Specification property.

Once you finish it, Please click on the save button and rename the table name.

Click OK to finish saving. Write the following Select statement to check whether the table holds all the column names or not.

TIP: You can use the INSERT Statement, or insert into to insert data into this newly created one.

Create Local and Global Temp

Here, we create local and global temporary or temp tables. Please refer Temporary article.

-- Local Temp
CREATE TABLE #LocalTemp
(
 [ID] [int] IDENTITY(1,1) NOT NULL,
 [Name] [nvarchar](255) NULL,
 [Occupation] [nvarchar](255) NULL,
 [Sales] [float] NULL
)
GO

-- Global Temp
CREATE TABLE ##GlobalTemp
(
 [ID] [int] IDENTITY(1,1) NOT NULL,
 [Name] [nvarchar](255) NULL,
 [Occupation] [nvarchar](255) NULL,
 [YearlyIncome] [float] NULL,
 [Sales] [float] NULL
)
GO